FACTORS INVOLVED IN PRODUCTION OF THIN WALL TILE*

A study was made relative to the dry pressing of wall tile having a thickness of ³/₁₆ in. Three bodies, a high talc, a high pyrophyllite, and a regular body were studied. The water content was kept constant and the forming pressures were varied from 1000 to 3000 lb. per sq. in. The bodies were fired to cones 4, 6, and 8. The bisque tile were tested for thermal expansion, warpage, absorption, shrinkage, impact strength, transverse strength, and moisture expansion. The glazed tile were tested for warpage, impact resistance, and moisture expansion. The results showed that satisfactory thin wall tile could be made from all bodies, the high-pyrophyllite body indicating the greatest promise. It was found that pressing pressures had definite effects on impact strength, warpage, shrinkage, and thermal expansion.